11978124667 has 4 divisors (see below), whose sum is σ = 12498912720. Its totient is φ = 11457336616.

The previous prime is 11978124659. The next prime is 11978124671. The reversal of 11978124667 is 76642187911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76642187911 = 25867 ⋅2962933.

It is a cyclic number.

It is not a de Polignac number, because 11978124667 - 2³ = 11978124659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978124967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260393992 + ... + 260394037.

It is an arithmetic number, because the mean of its divisors is an integer number (3124728180).

Almost surely, 2^11978124667 is an apocalyptic number.

11978124667 is a deficient number, since it is larger than the sum of its proper divisors (520788053).

11978124667 is an equidigital number, since it uses as much as digits as its factorization.

11978124667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520788052.

The product of its digits is 1016064, while the sum is 52.

The spelling of 11978124667 in words is "eleven billion, nine hundred seventy-eight million, one hundred twenty-four thousand, six hundred sixty-seven".